聚醚酰亚胺-硅树脂:10 μ m超薄复合膜,用于更快,更敏感的膜导入质谱分析

R. Alberici, R. Sparrapan, M. Eberlin, D. Windmöller, R. Augusti
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引用次数: 18

摘要

聚醚酰亚胺(聚酯)/有机硅(PEI/S)片复合膜具有10 μ m厚的交联有机硅层,具有所需的机械性能,可作为膜引入质谱(MIMS)分析水中挥发性有机化合物(VOC)的溶液/高真空界面。由于响应和恢复时间更短,与MIMS中通常使用的250 μ m硅酮膜相比,PEI/S膜允许更快的分析和校准过程。当使用EI时,由于过度的水渗透,PEI/S膜的响应(信号强度)并不总是优越的,这取决于分析物。然而,对于极性更高的VOCs, PEI/S膜表现出2-3倍的响应,改善了相对较差的MIMS检测限。当采用水-甲烷化学电离作用时,PEI/S膜的水渗透问题得到了缓解,并表现出较好的响应。
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Polyetherimide–silicone: a 10 µm ultrathin composite membrane for faster and more sensitive membrane introduction mass spectrometry analysis
A polyetherimide (polyester)/silicone (PEI/S) sheet composite membrane with a 10 µm thick cross-linked silicone layer is found to display the required mechanical properties to work efficiently as the solution/high vacuum interface in membrane introduction mass spectrometry (MIMS) analysis of volatile organic compounds (VOC) in water. Owing to much shorter response and recovery times, the PEI/S membrane allows much faster analysis and calibration procedures as compared to the 250 µm silicone membrane usually used in MIMS. When using EI, owing to excessive water permeation, responses (signal intensity) for the PEI/S membrane are not always superior, being analyte-dependent. For the more polar VOCs, however, the PEI/S membrane shows 2–3 times greater responses, improving their relatively poor MIMS detection limits. When water–methane chemical ionization is applied, the problem of excessive water permeation is attenuated, and the PEI/S membrane displays greatly superior responses.
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